Recent results from the ALICE experiment on open heavy flavours

Abstract

for the ALICE collaboration ALICE is the LHC experiment devoted to the study of the Quark-Gluon Plasma (QGP). To probe this high energy density state of strongly interacting matter expected to be produced in heavy-ion collisions at high energies, measurements performed in various systems (pp, p-Pb and Pb-Pb) are compared to each other. Heavy quarks are produced in initial hard partonic scatterings on a short time scale and participate in the subsequent evolution of the medium. This makes them sensitive probes of the QGP. With ALICE, open heavy flavours are studied using D mesons (D 0 , D + , D * + ) reconstructed via their hadronic decay channels in the mid-rapidity region (|y| < 0.5) and with heavy-flavour decay leptons reconstructed in the electronic (muonic) channel in the central rapidity region |y| < 0.9 (forward rapidity region 2.5 < y < 4). We present ALICE measurements of the nuclear modification factor R AA and the elliptic flow v 2 for D mesons and heavy-flavour decay leptons in Pb-Pb collisions at √ s NN = 2.76 TeV. The corresponding measurements in pPb collisions at √ s NN = 5.02 TeV are also discussed. First results on the azimuthal correlations between heavy-flavour particles and hadrons are presented as well as the charged-particle multiplicity dependence of heavy-flavour production in pp collisions at √ s = 7 TeV.

Transverse Momentum Dependent (TMD) Parton Distribution Functions: Status and Prospects

“…Phenomenological studies are carried out in [239][240][241][242][243][244][245][246][247][248]. Many features of these processes have been investigated experimentally at the LHC Run I [249][250][251][252][253][254][255]. Measurements of the spectra and especially of the polarization for J/ψ, Υ and all quarkonium states at Run II will be particularly interesting for studying polarized gluon effects.…”